Mix Match Radiators/Trans Cooling

[MrSchaeferPants]

So I bought my buddies 84 CUCV, it's a gasser now, he never finished installing the radiator because he didn't have the mounts. I bought a parts rig that has a 350/700r4.

I have a radiator out of his old 77 Jimmy that was a manual, the radiator from the 6.2 that was in the CUCV, and the radiator that's in the 86 parts truck.

The TH400 from the CUCV trans line runs to the driver's side to connect to the radiator, the 86s 700r4 trans lines run to the passenger side on the radiator.

Right now the 6.2 radiator is "in" place, not mounted yet. But the upper/lower hose are a different size for the 350 to 6.2 radiator. Anyone rigged up fix for this, or does anyone know of a hose that goes from the smaller 350 size hose, to the larger diameter 6.2 radiator?

Or do I cut my losses, use the 350 radiator, and re-plumb the TH400 fluid lines to be on the other side. It'd be nice to have the larger 6.2 radiator.

 

[76zimmer]

can you replace the water neck on the intake to a larger size?
I tried a diesel rad once, and I thought the lower hose was the same as a BBC?

 

[MrSchaeferPants]

I searched a bit, everything I read said to do what is already kinda done, metal adapter and 1/2 and 1/2 with the different size hoses. Not keen on that idea, might just re plumb. It'd be nice if the metal lines on the 700r4 and th400 use the same fitting, I'll just swap lines and put in the radiator from the parts truck.

OR, I do have some external cooler on the parts truck, haven't checked to see if it's engine oil or what. Could possibly use that.

 

[MrSchaeferPants]

can you replace the water neck on the intake to a larger size?
I tried a diesel rad once, and I thought the lower hose was the same as a BBC?

I dunno, never had a BBC, not sure if the water neck is larger or not, which'll leave the lower hose on the water pump still.

Think I'll try to swap the trans lines, they're both 80s Blazers with a 350, I'm sure they're bent the same, just a matter of the fitting size. Then I can use the radiator, shroud and hoses off the parts truck.

Which leads me to another question that I forgot about.

It wasn't a concern months ago when we did the work, the CUCV was going to be a trail rig only, but now I'll be DD'ing this when I'm done, so traffic, freeway speeds. The TH400 was behind a 6.2, now it's behind a 350. RPM, shifting, torque converter issues driving it around?

 

[41565chevelle]

I used the 6.2/big block radiator in my gasser. I have the 350 with a 700r4. I used a painless wiring relay set-up with a ford Mark VIII fan and made an aluminum fan shroud. It bolted right up, sat in the lower mount perfectly and the upper mount from a big block bolted right in. Picked up new rubber pads from classic industries an it was super simple.

 

[MrSchaeferPants]

ended up using the 350 radiator, putting in new transmission lines

 

[wheeler]

I know the gas and diesel th400s had different torque converters and vac modulators as well. The governor will be set really low but it will work. My th400 was from a cucv and behind a 350, it was governed to shift at about 3k rpm. You can get a governor weight set from jegs or summit for like 40 bucks and then you can get the governor wherever you'd like it. I also had a gas torque converter.

 

[MrSchaeferPants]

I know the gas and diesel th400s had different torque converters and vac modulators as well. The governor will be set really low but it will work. My th400 was from a cucv and behind a 350, it was governed to shift at about 3k rpm. You can get a governor weight set from jegs or summit for like 40 bucks and then you can get the governor wherever you'd like it. I also had a gas torque converter.

It seems to be doing just fine at the moment. I took it 2 hours up to the mountains to go camping this weekend, no problems. I didn't want to take it above 60mph, but I'm assuming that's my gearing/tires. It was hard to hear the engine rpms with no insulation or anything in the cucv + exhaust. But it seemed to be steady at 60.